Finding the Fourth Proportional to 2,407.50, 3,611.69 and 763.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,407.50 : 3,611.69 = 763.60 : x
2. Step 2: Convert to fraction form
   2,407.50/3,611.69 = 763.60/x
3. Step 3: Cross multiply
   2,407.50x = 3,611.69 × 763.60
4. Step 4: Simplify right side
   2,407.50x = 2,757,886.48
5. Step 5: Solve for x
   x = 2,757,886.48/2,407.50
6. Step 6: Final answer
   x = 1,145.54